Refill for a diffuser



FIG. 1 is a bottom perspective view of a refill for a diffuser showing our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image thereof;

FIG. 5 is a back end view thereof; and,

FIG. 6 is a front end view thereof.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for a refill for a diffuser, as shown and described. 